Definition

The optic nerve allows you to see by carrying images from your eye to your brain. Optic neuritis involves swelling of the optic nerve. This may cause reduced vision or loss of vision. It is a serious condition that requires immediate care from your doctor.

Risk Factors

Personal or family history of
multiple sclerosis
or other autoimmune disorders—Autoimmune diseases are more common in women of child-bearing age.

Previous history of optic neuritis

Previous history of transverse myelitis (inflammation of the spinal cord)

Symptoms

Symptoms of optic neuritis include:

Sudden decrease in vision—blurred, dark, or dim vision, or loss of vision in the center of, part of, or all of the visual field. In mild cases, it may look like “the lights are turned down.”

Abnormal color vision (dull and faded colors)

Pain in or around the eye (often made worse with eye movement)

Eye pain will often go away within a few days. Vision problems will improve in over 90% of patients. Some patients may be left with blurred, dark, dim, distorted vision, or complete visual loss. Vision usually improves over several weeks or months.

Diagnosis

Optic neuritis may be difficult to diagnose. Your eye may look perfectly normal. Your doctor will ask about your symptoms and medical history. A physical exam will be done. It will include a neurologic examination. You may be referred to an ophthalmologist (eye specialist) or neurologist (brain and nervous system specialist).

Your doctor may need to test your eye function. This can be done with:

Tests of color vision, side vision, visual acuity, and the reaction of the pupil to light

Your doctor may need pictures of your body structures. This can be done with an MRI scan

Your doctor may also need to evaluate you for spinal cord problems. This can be done with a somatosensory evoked potentials test.

Treatment

Talk with your doctor about the best treatment plan for you. Treatment options include:

Steroid medicine to reduce swelling of the optic nerve

Medicine to treat the cause of optic neuritis

Prevention

There is no known way to prevent optic neuritis the first time it happens. The chance of having it again may be reduced if the first episode is treated with a steroid or other medicine.
It is important to see a doctor right away if you develop pain or decreased vision.